US 12,278,392 B2
Separator for an electrochemical device including a porous organic/inorganic composite coating layer and an electrochemical device including same
Kyung-Ryun Ka, Daejeon (KR); Min-Ji Kim, Daejeon (KR); Seung-Hyun Lee, Daejeon (KR); and Hye-Won Kim, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
Filed on Aug. 12, 2024, as Appl. No. 18/800,881.
Application 18/800,881 is a continuation of application No. 18/647,536, filed on Apr. 26, 2024, granted, now 12,119,515.
Application 18/647,536 is a continuation of application No. PCT/KR2023/003116, filed on Mar. 7, 2023.
Claims priority of application No. 10-2022-0064640 (KR), filed on May 26, 2022.
Prior Publication US 2024/0405372 A1, Dec. 5, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 50/446 (2021.01); H01M 10/052 (2010.01); H01M 50/42 (2021.01); H01M 50/426 (2021.01); H01M 50/449 (2021.01)
CPC H01M 50/446 (2021.01) [H01M 10/052 (2013.01); H01M 50/42 (2021.01); H01M 50/426 (2021.01); H01M 50/449 (2021.01)] 21 Claims
OG exemplary drawing
 
1. An electrochemical device separator comprising a porous polymer substrate and an organic/inorganic composite porous coating layer formed on at least one side of the polymer substrate, wherein the organic/inorganic composite porous coating layer comprises particulate binder polymers and first inorganic particles,
the particulate binder polymers comprise hybrid polymer particles of a fluorine-based polymer and an acrylic-based polymer and acrylic-based polymer particles,
the acrylic polymer particles have a particle size D50 “a” in a range of 1 to 7 μm,
the first inorganic particles have a particle size D50 “b” in a range of 200 to 800 nm,
a/b is 2 to 15, and
the hybrid polymer particles have a particle size D50 smaller than that of the acrylic polymer particles.